Transcript PowerPoint
Weed Management in Cucurbits
Curcurbits
• Select Max • Sinbar • Alanap • Sandea • Curbit • Herbicide/Mulch relations
What’s New - Select Max
• clethodim – Registered 2006 – Select Max 0.97 EC – Apply twice the rate of Select 2 EC – For Cantaloupe, Cucumber, Squash, and Watermelon use 12-16 fl oz/A – Label allows for use of NIS instead of COC
Sinbar - Watermelon
2 to 3 oz of product applied preemergence
Seeded: make applications after planting but before the crop emergence
Transplants: Apply prior to transplant on bareground. May apply over mulch but ½ inch rainfall must occur following applications.
Now owned by Tessenderlo Kerley, Inc
% 100 90 80 70 60 50 40 30 20 10 0 Sinbar – watermelon injury and pigweed control 1.5 oz 3.0 oz 2 wk Watermelon Injury 5 wk Pigweed Control
Palmer Amaranth Control 8 WAT
100 90 80 70 60 50 40 30 20 10 0 Curbit + Sinbar 3oz + Sinbar 6oz Mulch No Mulch
Yellow Nutsedge Control 8 WAT
100 90 80 70 60 50 40 30 20 10 0 Curbit + Sinbar 3oz + Sinbar 6oz Mulch No Mulch
Watermelon Harvest (Total Weight) 1000 lbs/A
100 90 80 70 60 50 40 30 20 10 0 Curbit + Sinbar 3oz + Sinbar 6oz Mulch No Mulch
Curbit 1.5 pt/A PRE
Curbit 1.5 pt/A + Sinbar 2.5 oz
Curbit 1.5 pt/A + Sinbar 6 oz
Summary - Watermelon
Sinbar at 3 oz/A provided control of: a) Palmer amaranth = 78-89% b) Yellow nutsedge = 26-44% c) Tropic croton = 72-88% Sinbar at 6 oz/A provided control of: a) Palmer amaranth = 95-97% b) Yellow nutsedge = 78-80% c) Tropic croton = 97%
Cantaloupe – Sinbar
• Mulch and Bareground All plots received • Treatments (Sinbar applied pre-transplant) – 1) Curbit @ 1 qt/A – 2) Curbit @ 1 qt/A + Sinbar @ 3 oz/A – 3) Curbit @ 1 qt/A + Sinbar @ 6 oz/A
Cantalope Injury 5 WAT
100 90 80 70 60 50 40 30 20 10 0 Curbit + Sinbar 3oz + Sinbar 6oz Mulch No Mulch
Cantaloupe Runner Length 5 WAT
100 90 80 70 60 50 40 30 20 10 0 Curbit + Sinbar 3oz + Sinbar 6oz Mulch No Mulch
Summary
Bareground Production - Not a chance Mulch Production - Sinbar did not injury cantaloupe 5 WAT - Sinbar at 6 oz/A reduced runner length 10%, 5 WAT
Sinbar Carryover
• There are carryover issues after an application of Sinbar most notably the cole and greens crops. • Sinbar – The label states “Do not replant treated areas to any crop within 2 years after last application as injury to the subsequent crop(s) may result.”
Sinbar Watermelon CARRYOVER RESEARCH IN PROGRESS Label is very restrictive; UGA preliminary results: < 10% damage: sweet corn, squash, wheat, oat, rye, snap bean 1X rate 10 to 40% damage: cabbage, kale, broccoli, collard 2X rate: 40 to 80% damage: cabbage, kale, broccoli, collard
Alanap Going Away – Spring 2008
Chemtura voluntarily canceling registration
Production was stopped Oct. 2007
50,000 gal inventory
2.5 years of inventory if normal use continues
Shelf life is about 3 years
Alanap: Weeds Controlled
common ragweed common cocklebur common lambsquarters pigweeds chickweed purslane white mustard smartweeds
Production of this herbicide has ceased; 2 yrs of inventory
Non-treated
Curbit Curbit followed by Alanap
Sandea
• PRE/POST to crop: cucumber and cantaloupe • Row middle only: squash • PRE and row middle: watermelon
Sandea Labeled for Watermelon
1) PREEMERGENCE: 0.75 oz/A Seeded: Apply after planting, before cracking Transplant bareground/mulch: Do not transplant till 7 d after application.
* Avoid heavy rain right after application *DO NOT APPLY OVER MULCH and then transplant.
Nontreated Sandea (0.5 oz/A) Watermelon farm in Crisp County, May 2000. Treatment at 1-leaf. Pictures to scale.
Sandea for PRE Weed Control
common cocklebur wild radish pigweeds common ragweed common lambsquarters yellow nutsedge - suppression purple nutsedge - suppression
2 to 3 weeks residual weed control
Non-treated Control Sandea (0.5 oz/A) PRE W1-00. Halosulfuron study with Ken Lewis in Cordele.
No herbicide Sandea PRE
Sandea for POST Weed Control
1-3 inch
passionflower redroot pigweed pokeweed
1-9 inch
cocklebur ragweed velvetleaf yellow and purple nutsedge – heavy infestations may require sequential applications
2 to 3 weeks residual weed control
Curbit
1. Curbit is labeled for many cucurbits, Sonalan is not
Curbit
1. Curbit is labeled, Sonalan is not 2. Do not apply under mulch
Cucumber Injury from Curbit
Over mulch, washed off Under mulch
Over mulch, washed off Under mulch
Recommend 1 pt if seeded bareground.
If not contacting the crop (row middle or mulch) can go up to 3 pts
Amount of Curbit remaining on plastic mulch. TyTy GA, 2005.
100 80 60 washed no washed 40 20 0 0 1 2
days
3 4 5
Grey
Herbicide/Mulch Relations
Amount of paraquat remaining on plastic mulch. TyTy GA, 2005.
60 40 20 0 1 5 no wash washed 2 3
days
4
Grey
Amount of glyphosate remaining on plastic mulch. TyTy GA, 2005.
100 80 60 no wash washed 40 20 0 1 2 3
days
4 5
Grey
Halosulfuron dissipation on mulch 100 80 60 40 20 0 0 1 % halosulfuron Dry % halosulfuron Wash off 65% 2 Event 3 4 5 6%
Non-treated Sandea prior to transplant
Aim dissipation from mulch 100 80 60 40 20 0 0 1 % carfentrazone Dry % carfentrazone Wash off 2 3 Harvest event 4 5
New Herbicide for Watermelons – 2010?
Preplant or PRE application of Reflex SEVERE INJURY IF APPLIED TO EMERGED PLANTS
Percent watermelon injury from Reflex. Bareground System.
30 25 20 15 10 5 0
Reflex pre-transplant applied 16 oz/A .
Loc 1, 2002 Loc 2, 2003 Loc 3, 2003 Loc 4, 2004 Loc 5, 2006 Loc 6, 2007
Percent watermelon injury from Reflex. Mulched System.
20 Loc 1, 2003 Loc 2, 2006 Loc 3, 2007 0
Reflex applied 16 oz/A over mulch . Half inch irrigation prior to transplant.
Carryover from Reflex applied under mulch. Crops planted 6 months later. 2007 Seeded cucumber Transplant squash Transplant cabbage 100 Transplant cucumber Seeded collard Transplant broccoli Seeded squash Transplant collard Sweet corn 80 60 40 20 0